<template>

  <div>
      <p>{{zhi}}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr: [{
        name: '小明',
        age: 18
      }, {
        name: '小花',
        age: 25
      }, {
        name: '小爱',
        age: 21
      }]
    }
  },
  computed: {
    zhi () {
      let he = 0
      this.arr.forEach(item => {
        he += item.age
      })
      return he
    }
  }
}
</script>

<style>

</style>
